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Wavin is the leading supplier of plastic pipe systems and solutions. We connect you to better solutions for above and below ground projects in the following application areas: water management, heating and cooling, water and gas distribution, waste water and drainage.

Wavin Drainage System
Wavin Drainage System
Wavin Drainage System


Climate change brings intense rainfall. This means increased threat of urban flooding. Manage excess rainwater effectively and you boost sustainability. You reduce the risk of damage to buildings and infrastructure and threats to public health too.


Choose siphonic drainage when you need to drain large rainwater volumes from flat roof tops quickly and efficiently. Typically used on large industrial and commercial roofs, our siphonic system is a cost-effective substitute for traditional systems.

1). Wing nuts (2 pcs.)
2). Roof outlet function parts type 400
3). Nuts M8 (8 pcs.)
4). Loose flange
5). Roof foil
6). EPDM seal
7). Roof drain inlet element (2.5″ connection)
8). 2.5″ PE outlet connector 40-75mm
9). Insulating body (400/400mm), non-flammable (4038062)
10). Roof insulation
11). Vapour barrier connection screws (6 pcs.)
12). Vapour barrier bottom part
13). Vapour barrier top part
14). Vapour barrier bottom part
15). Fastening screws reinforcement plate
16). Reinforcement plate
17). Trapezoidal roof (alternatively concrete slab)